tests: allow prerelease deps on Python 3.9 (#207)

Closes #206.
googleapis · Aug 5, 2021 · cf77e60 · cf77e60
1 parent cbe3df7
commit cf77e60
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/testing/constraints-3.9.txt b/testing/constraints-3.9.txt
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+# Allow prerelease requirements
+--pre